SSP485N

{
  "schema_version": 1,
  "type": "component",
  "slug": "ssp485n",
  "title": "SSP485N",
  "brief": "Shanghai Siproin Microelectronics RS-485 / RS-422 ICs, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ssp485n"
  ],
  "component": {
    "mpn": "SSP485N",
    "manufacturer": "Shanghai Siproin Microelectronics",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/e50d2f88ccbbee28e6f3d4c68f46fd9a.pdf",
    "parts": {
      "symbol": "ssp485n.kicad_sym",
      "footprint": "ssp485n.kicad_mod",
      "model_3d": "ssp485n-etched.glb",
      "model_3d_plain": "ssp485n.glb",
      "model_3d_step": "ssp485n-etched.step",
      "model_3d_step_plain": "ssp485n.step",
      "lbr": "ssp485n.lbr"
    },
    "distributor_links": {
      "lcsc": "C2758009"
    },
    "pins": [
      {
        "number": "1",
        "name": "RO",
        "type": "output",
        "description": "Receiver output. When RE is low, RO is driven high if A-B >= +0.1V, low if A-B <= -0.1V, and high (fail-safe) if A/B are open or shorted. Output logic sense inverts automatically if A and B are physically swapped on the bus (polarity adaptation)."
      },
      {
        "number": "2",
        "name": "RE",
        "type": "input",
        "description": "Receiver output enable, active low. RO is enabled when RE is low; RO is high-impedance when RE is high. Typically tied low for continuous receive, or driven by the same MCU pin as DE for half-duplex direction control."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Driver output enable, active high. Bus outputs A and B are enabled when DE is high; both go high-impedance when DE is low. Commonly tied to /RE for MCU-driven half-duplex TX/RX steering."
      },
      {
        "number": "4",
        "name": "DI",
        "type": "input",
        "description": "Driver input (TTL/CMOS). With DE high and A wired to bus A: DI low drives A low and B high; DI high drives A high and B low. Logic sense inverts automatically when A/B are physically swapped on the bus (polarity adaptation)."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for logic and bus signaling. Connect to the local 0V rail; in isolated networks it becomes the 485GND reference for pull-up/pull-down bias network."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting RS-485 bus line: receiver input and driver output. Absolute voltage rating -13 V to +15 V; differential threshold ±100 mV; receiver input resistance >=96 kOhm (1/8 unit load). Polarity assignment relative to B is auto-detected 78 ms after power-on."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting RS-485 bus line: receiver input and driver output. Absolute voltage rating -13 V to +15 V; complementary to A. Polarity relative to A is determined automatically by the on-chip polarity-adaptation circuit."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, +5V typical (4.5V to 5.5V operating range, 7V absolute max). Quiescent supply current ~520 uA (DE high) / ~430 uA (DE low). Decouple locally with a 0.1 uF ceramic capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/e50d2f88ccbbee28e6f3d4c68f46fd9a.pdf",
        "pages": 10,
        "sha256": "ed3c328b4c0cfd81",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "ssp485n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ssp485n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "87e4d8dc8ea42b895369e191c9c3a15ea540d6ad3db35fcbcfdf34833945c372",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Shanghai Siproin Microelectronics",
      "Package": "SOP-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ssp485n"
  ],
  "discovery_pitch": "SSP485N (Shanghai Siproin Microelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ssp485n.kicad_sym",
    "ssp485n.kicad_mod",
    "ssp485n.glb",
    "ssp485n.step",
    "ssp485n-etched.step",
    "ssp485n.lbr",
    "docs/hero.png",
    "docs/ssp485n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SSP485N",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T08:11:17.518Z"
}